Kate sat outside of Castle's jail cell, coming up on 48 hours of working together. She kept telling him that she could let him out of his handcuffs, take him to her office so that he could feel more dignified. At this point, she wasn't worried about anyone around here using the trigger word.

Castle shook his head, "We talked about this, Kate. I'm not safe around you."

Her chest tightened with urgency as she continued to work on the computer, trying to find files to figure out where Castle's father was and why he would kidnap him.

"What if we can't find him?" Kate gave words to the fear that gripped her. She had been trying to be strong for Castle, but was getting nowhere. She needed her husband back and could not imagine one more day of him being trapped in this cell.

"Are Ryan and Esposito investigating up in the Hamptons?" Castle asked Kate, trying to assure her that they were at least making progress.

Kate nodded, "They got a new lead of someone who said they witnessed the kidnapping. But it could be nothing."

She looked down as her phone made a buzzing sound. Her hand shook as she saw the caller…maybe they had something?

"Ryan?" Kate said, trying to distinguish his voice among all of the background noise. They must be near a construction site.

"We have something. A hotel owner witnessed the kidnapping, said that the man who kidnapped Castle stayed in a hotel out here the night before."

Kate tried not to get frustrated, "How does that help us, Ryan? We talked to the hotel owner when Castle was kidnapped last time."

"The alias that was used at the hotel last time, is being used by a guest who is staying there right now," Ryan breathed.

Kate all but shouted as she jumped to her feet, "Stay out there, Ryan. We will be out there as soon as we can make it." Her fingers hit the end button on the phone. She looked at Castle. "I think your dad's in the Hamptons right now, we have to find him."

Castle smiled at Kate, "You have to go without me, honey. It's not safe."

"No, Castle," Kate needed him with her to complete the mission. What if Castle's father was the only one who knew how to deprogram him? "You have to come; we might need you to talk to him."

Castle gave Kate a hesitant stare. "Ok, but I want to keep the handcuffs on. That way, even if I get triggered, you will still be safe."

Kate unlocked the prison door, her fingers moving towards Castle's shoulder. She couldn't wait to bring him home and have all of this behind her, "Deal."

They began to walk down the hall of the precinct when her phone rang again, "Ryan, I told you. We will be at the Hamptons as soon as possible, just don't do anything…"

"Kate Beckett," a smooth, dark voice came on the line, "This is your father-in-law."

Kate stopped in her tracks, beckoning at Castle to listen in on the conversation.

"What do you want, Jackson?" Kate asked, using the only name that she knew the man by.

"I have your boys, here. If you want to keep them safe, you will bring my son to me immediately." The man said on the other end of the phone.

"We are heading there now, Jackson. But what do you want from us?" Kate exchanged glances with Castle, sharing a note of concern.

"I want exactly what I wanted from the other Beckett woman that crossed my path 16 years ago. I want you to leave me and my colleagues alone." Jackson threatened and then the phone clicked off.

She looked into Castle's eyes, "Does that mean what I think it means?"

She noted that Castle attempted to keep the brokenness from invading his words, "Kate, did my father have a hand in killing your mother?"